甘肃马鹿春秋季放牧对高寒草原土壤理化性质的影响
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摘要
为了探究甘肃马鹿(Cervus elaphus kansuensis)春秋季放牧对土壤理化性质的影响,本研究设置了6个放牧强度的样地,分析了0–40 cm土层的理化性质。结果表明,1)0–40 cm土层土壤容重随放牧强度的增强而逐渐上升,对表层土壤影响尤为显著(P <0.01);2)0–40 cm各土层土壤水分、土壤有机碳密度、土壤全氮密度和总量、土壤速效磷密度和总盐含量总体上随放牧增强呈下降趋势,其中土壤水分、全氮、速效磷密度和总盐含量与放牧强度呈极显著负相关(P <0.01),土壤有机碳密度与放牧强度呈显著负相关(P <0.05),0–40 cm土层植物根碳占土壤总有机碳比例随放牧率增加而逐渐升高,与放牧率呈显著正相关(P <0.05);10–20 cm土层全氮密度最大,土壤速效氮占全氮的比例随放牧增强呈上升趋势;0–40 cm各土层和土壤总C/N值均随放牧率增加呈下降趋势。研究结果可为揭示祁连山草原土草畜互作机制和可持续管理提供科学依据。
In order to investigate the effects of spring and autumn grazing on soil physical and chemical properties in Kansu wapiti(Cervus elaphus kansuensis), six grazing intensity plots were set up in this study, and the physical and chemical properties of 0 –40 cm soil layer were analyzed. The results showed that 1) the soil bulk density of 0 –40 cm soil layer increased with the increase of grazing intensity, especially to the surface soil(P < 0.01); 2) 0–40 cm soil moisture and soil organic carbon density Soil total nitrogen density and total amount, soil available phosphorus density and total salt content generally decreased with grazing enhancement, and soil moisture, total nitrogen, available phosphorus density and total salt content were significantly negatively correlated with grazing intensity(P < 0.01), soil organic carbon density was significantly negatively correlated with grazing intensity(P < 0.05), 0–40 cm soil layer plant root carbon accounted for total soil The proportion of organic carbon increased gradually with the increase of grazing rate, and it was positively correlated with grazing rate(P < 0.05). The density of total nitrogen in 10 –20 cm soil layer was the largest, and the ratio of soil available nitrogen to total nitrogen increased with grazing. The total C/N ratio of soil layer and soil in 0–40 cm decreased with the increase of grazing rate. The research results can provide a scientific basis for revealing the interaction mechanism and sustainable management of grassland and livestock in the Qilian Mountains.
In order to investigate the effects of spring and autumn grazing on soil physical and chemical properties in Kansu wapiti(Cervus elaphus kansuensis), six grazing intensity plots were set up in this study, and the physical and chemical properties of 0 –40 cm soil layer were analyzed. The results showed that 1) the soil bulk density of 0 –40 cm soil layer increased with the increase of grazing intensity, especially to the surface soil(P < 0.01); 2) 0–40 cm soil moisture and soil organic carbon density Soil total nitrogen density and total amount, soil available phosphorus density and total salt content generally decreased with grazing enhancement, and soil moisture, total nitrogen, available phosphorus density and total salt content were significantly negatively correlated with grazing intensity(P < 0.01), soil organic carbon density was significantly negatively correlated with grazing intensity(P < 0.05), 0–40 cm soil layer plant root carbon accounted for total soil The proportion of organic carbon increased gradually with the increase of grazing rate, and it was positively correlated with grazing rate(P < 0.05). The density of total nitrogen in 10 –20 cm soil layer was the largest, and the ratio of soil available nitrogen to total nitrogen increased with grazing. The total C/N ratio of soil layer and soil in 0–40 cm decreased with the increase of grazing rate. The research results can provide a scientific basis for revealing the interaction mechanism and sustainable management of grassland and livestock in the Qilian Mountains.
引文
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